draft-ietf-xrblock-rtcp-xr-jb-01.txt   draft-ietf-xrblock-rtcp-xr-jb-02.txt 
Audio/Video Transport Working Group A. Clark Audio/Video Transport Working Group A. Clark
Internet-Draft Telchemy Internet-Draft Telchemy
Intended status: Standards Track V. Singh Intended status: Standards Track V. Singh
Expires: April 20, 2013 Aalto University Expires: May 30, 2013 Aalto University
Q. Wu Q. Wu
Huawei Huawei
October 17, 2012 November 26, 2012
RTP Control Protocol (RTCP) Extended Report (XR) Block for Jitter Buffer RTP Control Protocol (RTCP) Extended Report (XR) Block for Jitter Buffer
Metric Reporting Metric Reporting
draft-ietf-xrblock-rtcp-xr-jb-01.txt draft-ietf-xrblock-rtcp-xr-jb-02.txt
Abstract Abstract
This document defines an RTP Control Protocol (RTCP) Extended Report This document defines an RTP Control Protocol (RTCP) Extended Report
(XR) Block that allows the reporting of Jitter Buffer metrics for a (XR) Block that allows the reporting of Jitter Buffer metrics for a
range of RTP applications. range of RTP applications.
Status of this Memo Status of this Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 20, 2013. This Internet-Draft will expire on May 30, 2013.
Copyright Notice Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Jitter Buffer Metrics Block . . . . . . . . . . . . . . . 3 1.1. Jitter Buffer Metrics Block . . . . . . . . . . . . . . . 3
1.2. RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . . 3 1.2. RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . . 3
1.3. Performance Metrics Framework . . . . . . . . . . . . . . 3 1.3. Performance Metrics Framework . . . . . . . . . . . . . . 3
1.4. Applicability . . . . . . . . . . . . . . . . . . . . . . 3 1.4. Applicability . . . . . . . . . . . . . . . . . . . . . . 3
2. Jitter Buffer Metrics Block . . . . . . . . . . . . . . . . . 4 2. Jitter Buffer Metrics Block . . . . . . . . . . . . . . . . . 4
2.1. Report Block Structure . . . . . . . . . . . . . . . . . . 4 2.1. Report Block Structure . . . . . . . . . . . . . . . . . . 4
2.2. Definition of Fields in Jitter Buffer Metrics Block . . . 4 2.2. Definition of Fields in Jitter Buffer Metrics Block . . . 4
3. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 7 3. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 7
3.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 7
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
4.1. New RTCP XR Block Type value . . . . . . . . . . . . . . . 8 4.1. New RTCP XR Block Type value . . . . . . . . . . . . . . . 8
4.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 8 4.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 8
4.3. Contact information for registrations . . . . . . . . . . 8 4.3. Contact information for registrations . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 9 5. Security Considerations . . . . . . . . . . . . . . . . . . . 9
6. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 10 6. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 10
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 11 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 11
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.1. Normative References . . . . . . . . . . . . . . . . . . . 12 8.1. Normative References . . . . . . . . . . . . . . . . . . . 12
8.2. Informative References . . . . . . . . . . . . . . . . . . 12 8.2. Informative References . . . . . . . . . . . . . . . . . . 12
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 13 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 13
A.1. draft-ietf-xrblock-rtcp-xr-jb-01 . . . . . . . . . . . . . 13 A.1. draft-ietf-xrblock-rtcp-xr-jb-02 . . . . . . . . . . . . . 13
A.2. draft-ietf-xrblock-rtcp-xr-jb-00 . . . . . . . . . . . . . 13 A.2. draft-ietf-xrblock-rtcp-xr-jb-01 . . . . . . . . . . . . . 13
A.3. draft-ietf-xrblock-rtcp-xr-jb-00 . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction 1. Introduction
1.1. Jitter Buffer Metrics Block 1.1. Jitter Buffer Metrics Block
This draft defines a new block type to augment those defined in This document defines a new block type to augment those defined in
[RFC3611], for use in a range of RTP applications. [RFC3611], for use in a range of RTP applications.
The new block type provides information on jitter buffer The new block type provides information on jitter buffer
configuration and performance. configuration and performance.
The metric belongs to the class of transport-related terminal metrics The metric belongs to the class of transport-related end system
defined in [MONARCH]. metrics defined in [RFC6792].
Instances of this Metrics Block refer by SSRC to the separate Instances of this Metrics Block refer by SSRC to the separate
auxiliary Measurement Information block [MEASI] which contains auxiliary Measurement Information block [RFC6776] which contains
information such as the SSRC of the measured stream, and RTP sequence information such as the SSRC of the measured stream, and RTP sequence
numbers and time intervals indicating the span of the report. numbers and time intervals indicating the span of the report.
1.2. RTCP and RTCP XR Reports 1.2. RTCP and RTCP XR Reports
The use of RTCP for reporting is defined in [RFC3550]. [RFC3611] The use of RTCP for reporting is defined in [RFC3550]. [RFC3611]
defined an extensible structure for reporting using an RTCP Extended defined an extensible structure for reporting using an RTCP Extended
Report (XR). This draft defines a new Extended Report block for use Report (XR). This document defines a new Extended Report block for
with [RFC3550] and [RFC3611]. use with [RFC3550] and [RFC3611].
1.3. Performance Metrics Framework 1.3. Performance Metrics Framework
The Performance Metrics Framework [RFC6390] provides guidance on the The Performance Metrics Framework [RFC6390] provides guidance on the
definition and specification of performance metrics. The RTP definition and specification of performance metrics. The RTP
Monitoring Architectures [MONARCH] provides guideline for reporting Monitoring Architectures [RFC6792] provides guideline for reporting
block format using RTCP XR. Metrics described in this draft are in block format using RTCP XR. Metrics described in this draft are in
accordance with the guidelines in [RFC6390][MONARCH]. accordance with the guidelines in [RFC6390][RFC6792].
1.4. Applicability 1.4. Applicability
These metrics are applicable to a range of RTP applications. Real-time applications employ a jitter buffer to smooth out jitter
encountered on the path from source to destination. These metrics
Editor Note: What the use is for reporting jitter buffer metrics? are used to measure how the jitter buffer behave as a result of the
jitter and applicable to a range of RTP applications. These metrics
reflect terminal related factor that most affects real-time
application quality and useful to provide more precise estimation for
user experience to the quality of real-time application performance
and also valuable to network manager in troubleshooting network.
2. Jitter Buffer Metrics Block 2. Jitter Buffer Metrics Block
This block describes the configuration and operating parameters of This block describes the configuration and operating parameters of
the jitter buffer in the receiver of the RTP end system or RTP mixer the jitter buffer in the receiver of the RTP end system or RTP mixer
which sends the report. Instances of this Metrics Block refer by which sends the report. Instances of this Metrics Block refer by
SSRC to the separate auxiliary Measurement Information block [MEASI] SSRC to the separate auxiliary Measurement Information block
which contains measurement intervals. This metric block relies on [RFC6776] which contains measurement intervals. This metric block
the measurement interval in the Measurement Information block relies on the measurement interval in the Measurement Information
indicating the span of the report and should be sent in the same block indicating the span of the report and should be sent in the
compound RTCP packet as the measurement information block. If the same compound RTCP packet as the measurement information block. If
measurement interval is not received in the same compound RTCP packet the measurement interval is not received in the same compound RTCP
as this metric block, this metric block should be discarded. packet as this metric block, this metric block should be discarded.
2.1. Report Block Structure 2.1. Report Block Structure
JB Metrics Block JB Metrics Block
0 1 2 3 0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BT=NJB | I |jb cfg |rsv| block length=3 | | BT=NJB | I |jb cfg |rsv| block length=3 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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A Jitter Buffer Metrics Report Block is identified by the constant A Jitter Buffer Metrics Report Block is identified by the constant
NJB. NJB.
[Note to RFC Editor: please replace NJB with the IANA provided [Note to RFC Editor: please replace NJB with the IANA provided
RTCP XR block type for this block.] RTCP XR block type for this block.]
Interval Metric flag (I): 2 bits Interval Metric flag (I): 2 bits
This field is used to indicate whether the Jitter Buffer metrics This field is used to indicate whether the Jitter Buffer metrics
are Sampled, Interval or Cumulative metrics, that is, whether the are Sampled, Interval or Cumulative metrics:
reported values applies to the most recent measurement interval
duration between successive metrics reports (I=10) (the Interval I=10: Interval Duration - the reported value applies to the
Duration) or to the accumulation period characteristic of most recent measurement interval duration between successive
cumulative measurements (I=11) (the Cumulative Duration) or is a metrics reports.
sampled instantaneous value (I=01) (Sampled Value).
I=11: Cumulative Duration - the reported value applies to the
accumulation period characteristic of cumulative measurements.
I=01: Sampled Value - the reported value is a sampled
instantaneous value.
Jitter Buffer Configuration (jb cfg): 4 bits Jitter Buffer Configuration (jb cfg): 4 bits
This field is used to identify the jitter buffer method in use at This field is used to identify the jitter buffer method in use at
the receiver, according to the following code: the receiver, according to the following code:
bits 014-011 bits 014-011
0 = Fixed jitter buffer 0 = Fixed jitter buffer
1 = Adaptive jitter buffer 1 = Adaptive jitter buffer
Other values reserved Other values reserved
Reserved (rsv): 2 bits Reserved (rsv): 2 bits
These bits are reserved. They SHOULD be set to zero by senders These bits are reserved. They MUST be set to zero by senders
and MUST be ignored by receivers. ignored by receivers (See RFC6709 section 4.2).
Block Length: 16 bits Block Length: 16 bits
The length of this report block in 32-bit words, minus one and The length of this report block in 32-bit words, minus one and
MUST be set to 3, in accordance with the definition of this field MUST be set to 3, in accordance with the definition of this field
in [RFC3611]. The block MUST be discarded if the block length is in [RFC3611]. The block MUST be discarded if the block length is
set to a different value. set to a different value.
jitter buffer nominal delay (JB nominal): 16 bits jitter buffer nominal delay (JB nominal): 16 bits
This is the current nominal jitter buffer delay in milliseconds, This is the current nominal jitter buffer delay in milliseconds,
which corresponds to the nominal jitter buffer delay for packets which corresponds to the nominal jitter buffer delay for packets
that arrive exactly on time. This parameter MUST be provided for that arrive exactly on time. It is calculated based on the time
both fixed and adaptive jitter buffer implementations. for packets spent in the jitter buffer. This parameter MUST be
provided for both fixed and adaptive jitter buffer
implementations.
If the measured value exceeds 0xFFFD, the value 0xFFFE SHOULD be If the measured value exceeds 0xFFFD, the value 0xFFFE SHOULD be
reported to indicate an over-range measurement. If the reported to indicate an over-range measurement. If the
measurement is unavailable, the value 0xFFFF SHOULD be reported. measurement is unavailable, the value 0xFFFF SHOULD be reported.
jitter buffer maximum delay (JB maximum): 16 bits jitter buffer maximum delay (JB maximum): 16 bits
This is the current maximum jitter buffer delay in milliseconds This is the current maximum jitter buffer delay in milliseconds
which corresponds to the earliest arriving packet that would not which corresponds to the earliest arriving packet that would not
be discarded. In simple queue implementations this may correspond be discarded. In simple queue implementations this may correspond
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If the measured value exceeds 0xFFFD, the value 0xFFFE SHOULD be If the measured value exceeds 0xFFFD, the value 0xFFFE SHOULD be
reported to indicate an over-range measurement. If the reported to indicate an over-range measurement. If the
measurement is unavailable, the value 0xFFFF SHOULD be reported. measurement is unavailable, the value 0xFFFF SHOULD be reported.
3. SDP Signaling 3. SDP Signaling
[RFC3611] defines the use of SDP (Session Description Protocol) [RFC3611] defines the use of SDP (Session Description Protocol)
[RFC4566] for signaling the use of XR blocks. XR blocks MAY be used [RFC4566] for signaling the use of XR blocks. XR blocks MAY be used
without prior signaling. without prior signaling.
3.1. SDP rtcp-xr-attrib Attribute Extension
This section augments the SDP [RFC4566] attribute "rtcp-xr" defined This section augments the SDP [RFC4566] attribute "rtcp-xr" defined
in [RFC3611] by providing an additional value of "xr-format" to in [RFC3611] by providing an additional value of "xr-format" to
signal the use of the report block defined in this document. signal the use of the report block defined in this document.
xr-format =/ xr-jb-block xr-format =/ xr-jb-block
xr-jb-block = "jitter-bfr" xr-jb-block = "jitter-bfr"
3.2. Offer/Answer Usage
When SDP is used in offer-answer context, the SDP Offer/Answer usage
defined in [RFC3611] for unilateral "rtcp-xr" attribute parameters
applies. For detailed usage in Offer/Answer for unilateral
parameter, refer to section 5.2 of [RFC3611].
4. IANA Considerations 4. IANA Considerations
New block types for RTCP XR are subject to IANA registration. For New block types for RTCP XR are subject to IANA registration. For
general guidelines on IANA considerations for RTCP XR, refer to general guidelines on IANA considerations for RTCP XR, refer to
[RFC3611]. [RFC3611].
4.1. New RTCP XR Block Type value 4.1. New RTCP XR Block Type value
This document assigns the block type value NJB in the IANA "RTCP XR This document assigns the block type value NJB in the IANA "RTCP XR
Block Type Registry" to the "JB Metrics Block". Block Type Registry" to the "JB Metrics Block".
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[RFC3550] Schulzrinne, H., "RTP: A Transport Protocol for Real-Time [RFC3550] Schulzrinne, H., "RTP: A Transport Protocol for Real-Time
Applications", RFC 3550, July 2003. Applications", RFC 3550, July 2003.
[RFC3611] Friedman, T., Caceres, R., and A. Clark, "RTP Control [RFC3611] Friedman, T., Caceres, R., and A. Clark, "RTP Control
Protocol Extended Reports (RTCP XR)", November 2003. Protocol Extended Reports (RTCP XR)", November 2003.
[RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session [RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session
Description Protocol", July 2006. Description Protocol", July 2006.
8.2. Informative References [RFC6709] Carpenter, B., Aboba, B., and S. Cheshire, "Design
Considerations for Protocol Extensions", RFC 6709,
[MEASI] Hunt, G., "Measurement Identity and information Reporting September 2012.
using SDES item and XR Block",
ID draft-ietf-xrblock-rtcp-xr-meas-identity-10,
August 2012.
[MONARCH] Hunt, G., "Monitoring Architectures for RTP", 8.2. Informative References
ID draft-ietf-avtcore-monarch-22, September 2012.
[RFC6390] Clark, A. and B. Claise, "Framework for Performance Metric [RFC6390] Clark, A. and B. Claise, "Framework for Performance Metric
Development", RFC 6390, October 2011. Development", RFC 6390, October 2011.
[RFC6776] Wu, Q., "Measurement Identity and information Reporting
using SDES item and XR Block", RFC 6776, August 2012.
[RFC6792] Hunt, G., Wu, Q., and P. Arden, "Monitoring Architectures
for RTP", RFC 6792, November 2012.
Appendix A. Change Log Appendix A. Change Log
Note to the RFC-Editor: please remove this section prior to Note to the RFC-Editor: please remove this section prior to
publication as an RFC. publication as an RFC.
A.1. draft-ietf-xrblock-rtcp-xr-jb-01 A.1. draft-ietf-xrblock-rtcp-xr-jb-02
The following are the major changes to previous version :
o Add some explaination text in the SDP offer/answer section.
o Add some text in applicability section to explain the use to
report jitter buffer metrics.
o Other editorial change changes aligning with PDV,Delay draft.
A.2. draft-ietf-xrblock-rtcp-xr-jb-01
The following are the major changes to previous version : The following are the major changes to previous version :
o Outdated reference update o Outdated reference update
o Add one Editor notes to ask clarification on the use of reporting o Add one Editor notes to ask clarification on the use of reporting
jitter buffer metrics. jitter buffer metrics.
o Other Editorial changes. o Other Editorial changes.
A.2. draft-ietf-xrblock-rtcp-xr-jb-00 A.3. draft-ietf-xrblock-rtcp-xr-jb-00
The following are the major changes to previous version : The following are the major changes to previous version :
o Boilerplate updates. o Boilerplate updates.
o references updates o references updates
o allocate 32 bit field in report block for SSRC o allocate 32 bit field in report block for SSRC
o Other editorial changes to get alignment with MONARCH draft. o Other editorial changes to get alignment with MONARCH draft.
 End of changes. 24 change blocks. 
44 lines changed or deleted 81 lines changed or added

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